If you are a fan of first person shooters, you simply have to get this game (especially for 25 pounds, it is a bargain!). The story mode is gripping - I haven't quite finished it yet, but so far, at no point during the game have I started getting bored. Online is also good, but I have to say not quite as good as Black Ops.
The reason I have given this 5 stars instead of 4 is because of the unique advantage this game has over other FPS games at the moment - Playstation Move. When you combine this game with Playstation Move and Playstation Sharpshooter attachment, it is a completely different experience. I have to admit that I still haven't quite got used to using Move instead of the usual controller and as a result, I don't do as well online. However, games are meant to be fun and if you are willing to sacrifice your stats slightly, then using the Move is 10x better.